摘要
根据德鲁克-普拉格屈服准则,使用三维有限元数值分析方法,研究了某变截面地下洞库开挖过程中引起的围岩变形规律和岩体稳定性。分析结果表明,在Ⅱ类围岩条件下岩体变形值较小,洞库变截面处岩体是稳定的；但在Ⅲ类围岩中,变截面处围岩出现明显的塑性区,且塑性区的范围随着扩大断面跨度的增大而扩大。
To study the surrounding rock＇s stability and the laws of deformation, three - dimensional finite element numerical modeling technique is used for the changed - section excavation in underground cavity construction, based on the Drueker- Prager yield criterion. The results show that the surrounding rocks are stable in grade Ⅱ rock, the deformation is small. But in the ease of grade Ⅲ , some of surrounding rocks have yielded, and the size of plastic zones became larger with increasing magnitude of the big - section span. Key words ：
出处
《低温建筑技术》
2006年第5期62-63,115,共3页
Low Temperature Architecture Technology
关键词
变截面洞库
德鲁克-普拉格准则
围岩稳定性
changed-section cavity
Drueker - Prager criterion
stability of surrounding rocks
